Question # 1

The work done will be zero when the angle between the force and the displacement is:

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45°

60°

90°

180°

In Einstein's mass-energy equation ,c is the

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Speed of sound

Speed of light

Speed of electron

Speed of Earth

if a body of a mass 'm' is moving with velocity 'v' then its K.E. is given by

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K.E. = 1/2 mv

K.E. = 1/2 mv2

K.E. = mv2

K.E. = 1/2 m2v

A body OF mass 10 kg taken to height of 5m:

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P.E = 500 J

P.E = 50 J

P.E = 5 J

P.E = 5000 J

The ratio of useful output to input energy is called:

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Power

Energy

Efficiency

Horse power

Mathematically, % efficiency is defined as & nbsp

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Efficiency % required form or input/ total input energy x 100

Efficiency % input energy / output energy x 100

Efficiency % work / time x 100

Stretched how has type of energy:

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K.E

mgh

P.E

Elastic P.E

Formula of Power:

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P = wt

P = w/t

P = t/w

P = w/t²

1 hp is equal to :

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747 W

746 W

748 W

1000 W

When a body is lifted through a height h, the work donw on it appears in the form of its.

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Kinetic energy

Potential energy

Elastic energy

Geothermal energy

Work is done when force displace inits own _____________

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Way

Method

Direction

None

Formula of Gravitational potential energy is:

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mgh

mg/h

1/2 mv²

None of these

P.E is equal to:

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mgh

1/2 mv²

W x F

None of these

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Physics 9th Class English Medium Unit 6 Online Test MCQs With Answers

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